The more the merrier: SRG/eROSITA discovers two further galaxies showing X-ray quasi-periodic eruptions

被引：37

作者：

Arcodia, R. ^{[1
,2
]}

Liu, Z. ^{[2
]}

Merloni, A. ^{[2
]}

Malyali, A. ^{[2
]}

Rau, A. ^{[2
]}

Chakraborty, J. ^{[1
]}

Goodwin, A. ^{[3
]}

Buckley, D. ^{[4
]}

Brink, J. ^{[4
]}

Gromadzki, M. ^{[5
]}

Arzoumanian, Z. ^{[6
]}

Buchner, J. ^{[2
]}

Kara, E. ^{[1
]}

Nandra, K. ^{[2
]}

Ponti, G. ^{[2
,7
]}

Salvato, M. ^{[2
]}

Anderson, G. ^{[3
]}

Baldini, P. ^{[2
]}

Grotova, I. ^{[2
]}

Krumpe, M. ^{[8
]}

Maitra, C. ^{[2
]}

Miller-Jones, J. C. A. ^{[3
]}

Ramos-Ceja, M. E. ^{[2
]}

机构：

[1] MIT, Kavli Inst Astrophys & Space Res, 70 Vassar St, Cambridge, MA 02139 USA

[2] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany

[3] Curtin Univ, Int Ctr Radio Astron Res, GPO POB U1987, Perth, WA 6845, Australia

[4] South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa

[5] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[6] NASA Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

[7] INAF, Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy

[8] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 684卷

基金：

欧洲研究理事会; 澳大利亚研究理事会;

关键词：

accretion; accretion disks; surveys; galaxies: active; galaxies: nuclei; X-rays: bursts; X-rays: galaxies; TIDAL-DISRUPTION EVENT; UNSTABLE MASS-TRANSFER; PHOTON IMAGING CAMERA; STAR-DISK COLLISIONS; DEPTH SURVEY EFEDS; BLACK-HOLE; XMM-NEWTON; GSN; 069; STELLAR POPULATION; NUCLEAR TRANSIENT;

D O I：

10.1051/0004-6361/202348881

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

X-ray quasi-periodic eruptions (QPEs) are a novel addition to the group of extragalactic transients. In this work, we report the discovery of two further galaxies showing QPEs, eRO-QPE3 and eRO-QPE4, with the eROSITA X-ray telescope on board the Spectrum Roentgen Gamma observatory. Among the properties in common with those of known QPEs are: the thermal-like spectral shape in eruption (up to kT similar to 110-120 eV) and quiescence (kT similar to 50-90 eV) and its evolution during the eruptions (with a harder rise than decay); the lack of strong canonical signatures of active nuclei (from current optical, UV, infrared and radio data); and the low-mass nature of the host galaxies (logM(& lowast;)approximate to 9-10) and their massive central black holes (logM(BH)approximate to 5-7). These discoveries also bring several new insights into the QPE population: i) eRO-QPE3 shows eruptions on top of a decaying quiescence flux, providing further evidence for a connection between QPEs and a preceding tidal disruption event; ii) eRO-QPE3 exhibits the longest recurrence times and faintest peak luminosity of QPEs, compared to the known QPE population, excluding a correlation between the two; iii) we find evidence, for the first time, of a transient component that is harder, albeit much fainter, than the thermal QPE spectrum in eRO-QPE4; and iv) eRO-QPE4 displays the appearance (or significant brightening) of the quiescence disk component after the detection of QPEs, supporting its short-lived nature against a preexisting active galactic nucleus. Overall, the newly discovered properties (e.g., recent origin and/or transient nature of the quiescent accretion disk; lack of correlation between eruption recurrence timescales and luminosity) are qualitatively consistent with recent models that identify QPEs as extreme mass-ratio inspirals.

引用

页数：22

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